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Experimental Physics

70 practice questions with a worked solution for each. Tap an option to see instantly if you are right.

58MCQ12Numerical9With diagram
Start with question 1 Revise Modern Physics first
  1. 1In a screw gauge when the circular scale is given five complete rotations it moves linearly by 2.52.5 mm. If the circular scale has 100100 divisions, the least count of screw gauge is _____ mm.JEE Main/MCQ/Medium/Experimental Physics
  2. 2In a screw gauge the zero of main scale reference line coincides with the fifth division of the circular scale when two studs are in contact. There are 100100 divisions in circular scale and pitch of screw gauge is 0.10.1 mm. When diameter of a sphere is measured, the reading of main scale is 55 mm and 50th50^{\text{th}} division of circular scale coincides with the reference line of main scale. The diameter of sphere is _______ mm.JEE Main/MCQ/Medium/Experimental Physics
  3. 3In an experiment, a set of reading are obtained as follows - 1.24 mm,1.25 mm,1.23 mm1.24 \mathrm{~mm}, 1.25 \mathrm{~mm}, 1.23 \mathrm{~mm}, 1.21 mm. The expected least count of the instrument used in recording these readings is ____\_\_\_\_ mm.JEE Main/MCQ/Medium/Experimental Physics
  4. 4When both jaws of vernier callipers touch each other, zero mark of the vernier scale is right to zero mark of main scale, 4th 4^{\text {th }} mark on vernier scale coincides with certain mark on the main scale. While measuring the length of a cylinder, observer observes 15 divisions on main scale and 5th 5^{\text {th }} division of vernier scale coincides with a main scale division. Measured length of cylinder is ____\_\_\_\_ mm.
    (Least count of Vernier calliper     =0.1 mm=0.1 \mathrm{~mm})    JEE Main/MCQ/Medium/Experimental Physics
  5. 5In a vernier callipers, 50 vernier scale divisions are equal to 48 main scale divisions. If one main scale division =0.05 mm=0.05 \mathrm{~mm}, then the least count of the vernier callipers is ____\_\_\_\_ mm.JEE Main/MCQ/Medium/Experimental Physics
  6. 6In a screw gauge, the zero of the circular scale lies 3 divisions above the horizontal pitch line when their metallic studs are brought in contact. Using this instrument thickness of a sheet is measured. If pitch scale reading is 1 mm and the circular scale reading is 51 then the correct thickness of the sheet is ____\_\_\_\_ mm.
    [Assume least count is 0.01 mm ]    JEE Main/MCQ/Medium/Experimental Physics
  7. 7For the determination of refractive index of glass slab, a travelling microscope is used whose main scale contains 300 equal divisions equals to 15 cm. The vernier scale attached to the microscope has 25 divisions equals to 24 divisions of main scale. The least count (LC) of the travelling microscope is (in cm) :JEE Main/MCQ/Medium/Experimental Physics
  8. 8A tiny metallic rectangular sheet has length and breadth of 5 mm and 2.5 mm , respectively. Using a specially designed screw gauge which has pitch of 0.75 mm and 15 divisions in the circular scale, you are asked to find the area of the sheet. In this measurement, the maximum fractional error will be x100\frac{x}{100} where xx is _________.JEE Main/Numerical/Medium/Experimental Physics
  9. 9The least count of a screw guage is 0.01 mm . If the pitch is increased by 75%75 \% and number of divisions on the circular scale is reduced by 50%50 \%, the new least count will be _____ ×10−3 mm\times 10^{-3} \mathrm{~mm}JEE Main/Numerical/Medium/Experimental Physics
  10. 10Given below are two statements :
    Statement I : In a vernier callipers, one vernier scale division is always smaller than one main scale division.
    Statement II : The vernier constant is given by one main scale division multiplied by the number of vernier scale divisions.
    In the light of the above statements, choose the correct answer from the options given below.    JEE Main/MCQ/Medium/Experimental Physics
  11. 11One main scale division of a vernier caliper is equal to mm units. If nth \mathrm{n}^{\text {th }} division of main scale coincides with (n+1)th (n+1)^{\text {th }} division of vernier scale, the least count of the vernier caliper is :JEE Main/MCQ/Medium/Experimental Physics
  12. 12There are 100 divisions on the circular scale of a screw gauge of pitch 1 mm1 \mathrm{~mm}. With no measuring quantity in between the jaws, the zero of the circular scale lies 5 divisions below the reference line. The diameter of a wire is then measured using this screw gauge. It is found that 4 linear scale divisions are clearly visible while 60 divisions on circular scale coincide with the reference line. The diameter of the wire is :JEE Main/MCQ/Medium/Experimental Physics
  13. 13Least count of a vernier caliper is 120 N cm\frac{1}{20 \mathrm{~N}} \mathrm{~cm}. The value of one division on the main scale is 1 mm1 \mathrm{~mm}. Then the number of divisions of main scale that coincide with N\mathrm{N} divisions of vernier scale is :JEE Main/MCQ/Medium/Experimental Physics
  14. 14The diameter of a sphere is measured using a vernier caliper whose 9 divisions of main scale are equal to 10 divisions of vernier scale. The shortest division on the main scale is equal to 1 mm1 \mathrm{~mm}. The main scale reading is 2 cm2 \mathrm{~cm} and second division of vernier scale coincides with a division on main scale. If mass of the sphere is 8.635 g, the density of the sphere is:JEE Main/MCQ/Medium/Experimental Physics
  15. 15In a vernier calliper, when both jaws touch each other, zero of the vernier scale shifts towards left and its 4th 4^{\text {th }} division coincides exactly with a certain division on main scale. If 50 vernier scale divisions equal to 49 main scale divisions and zero error in the instrument is 0.04 mm0.04 \mathrm{~mm} then how many main scale divisions are there in 1 cm1 \mathrm{~cm} ?JEE Main/MCQ/Medium/Experimental Physics
  16. 16While measuring diameter of wire using screw gauge the following readings were noted. Main scale reading is 1 mm1 \mathrm{~mm} and circular scale reading is equal to 42 divisions. Pitch of screw gauge is 1 mm1 \mathrm{~mm} and it has 100 divisions on circular scale. The diameter of the wire is x50 mm\frac{x}{50} \mathrm{~mm}. The value of xx is :JEE Main/MCQ/Medium/Experimental Physics
  17. 17A vernier callipers has 20 divisions on the vernier scale, which coincides with 19th 19^{\text {th }} division on the main scale. The least count of the instrument is 0.1 mm0.1 \mathrm{~mm}. One main scale division is equal to _____mm\mathrm{mm}.JEE Main/MCQ/Medium/Experimental Physics
  18. 181010 divisions on the main scale of a Vernier calliper coincide with 1111 divisions on the Vernier scale. If each division on the main scale is of 55 units, the least count of the instrument is :JEE Main/MCQ/Medium/Experimental Physics
  19. 19The measured value of the length of a simple pendulum is 20cm20cm with 2mm2mm accuracy. The time for 5050 oscillations was measured to be 4040 seconds with 11 second resolution. From these measurements, the accuracy in the measurement of acceleration due to gravity is NN%. The value of NN is:JEE Main/MCQ/Medium/Experimental Physics
  20. 20If 5050 Vernier divisions are equal to 4949 main scale divisions of a travelling microscope and one smallest reading of main scale is 0.5mm0.5mm the Vernier constant of travelling microscope is:JEE Main/MCQ/Medium/Experimental Physics
  21. 21Given below are two statements: one is labelled as Assertion(A) and the other is labelled as Reason (R).
    Assertion (A) : In Vernier calliper if positive zero error exists, then while taking measurements, the reading taken will be more than the actual reading.
    Reason (R) : The zero error in Vernier Calliper might have happened due to manufacturing defect or due to rough handling.
    In the light of the above statements, choose the correct answer from the options given below :    JEE Main/MCQ/Medium/Experimental Physics
  22. 22Identify the physical quantity that cannot be measured using spherometer :JEE Main/MCQ/Medium/Experimental Physics
  23. 23In an experiment with vernier callipers of least count 0.1mm0.1mm, when two jaws are joined together the zero of vernier scale lies right to the zero of the main scale and 6th{6}^{th} division of vernier scale coincides with the main scale division. While measuring the diameter of a spherical bob, the zero of vernier scale lies in between 3.2cm3.2cm and 3.3cm3.3cm marks and 4th{4}^{th} division of vernier scale coincides with the main scale division. The diameter of bob is measured asJEE Main/MCQ/Medium/Experimental Physics
  24. 24In a screw gauge, there are 100100 divisions on the circular scale and the main scale moves by 0.5mm0.5mm on a complete rotation of the circular scale. The zero of circular scale lies 66 divisions below the line of graduation when two studs are brought in contact with each other. When a wire is placed between the studs, 44 linear scale divisions are clearly visible while 46th division the circular scale coincide with the reference line. The diameter of the wire is ______ ×10−2mm.\times {10}^{-2}mm.JEE Main/Numerical/Medium/Experimental Physics
  25. 25When two resistance R1{R}_{1} and R2{R}_{2} connected in series and introduced into the left gap of a meter bridge and a resistance of 10Ω10\Omega is introduced into the right gap, a null point is found at 60cm60cm from left side. When R1{R}_{1} and R2{R}_{2} are connected in parallel and introduced into the left gap, a resistance of 3Ω3\Omega is introduced into the right-gap to get null point at 40cm40cm from left end. The product of R1R2{R}_{1}{R}_{2} is ______ Ω2{\Omega }^{2}JEE Main/Numerical/Medium/Experimental Physics
  26. 26In a metre bridge experiment the balance point is obtained if the gaps are closed by 2Ω2\Omega and 3Ω3\Omega. A shunt of XΩX\Omega is added to 3Ω3\Omega resistor to shift the balancing point by 22.5cm22.5cm. The value of XX is ______.JEE Main/Numerical/Medium/Experimental Physics
  27. 27In an experiment to find out the diameter of wire using screw gauge, the following observation were noted:

    (a) Screw moves     0.5mm0.5mm on main scale in one complete rotation
    (b) Total divisions on circular scale     =50=50
    (c) Main scale reading is     2.5mm2.5mm
    (d)     45th{45}^{th}{}^{} division of circular scale is in the pitch line
    (e) Instrument has     0.03mm0.03mm negative error Then the diameter of wire is :    JEE Main/MCQ/Medium/Experimental Physics/With diagram
  28. 28A travelling microscope has 2020 divisions per cmcm on the main scale while its Vernier scale has total 5050 divisions and 2525 Vernier scale divisions are equal to 2424 main scale divisions, what is the least count of the travelling microscope ?JEE Main/MCQ/Medium/Experimental Physics
  29. 29The one division of main scale of vernier callipers reads 1mm1mm and 1010 divisions of Vernier scale is equal to the 99 divisions on main scale. When the two jaws of the instrument touch each other the zero of the Vernier lies to the right of zero of the main scale and its fourth division coincides with a main scale division. When a spherical bob is tightly placed between the two jaws, the zero of the Vernier scale lies in between 4.1cm4.1cm and 4.2cm4.2cm and 6th{6}^{th} Vernier division coincides with a main scale division. The diameter of the bob will be _____ 10−2cm{10}^{-2}cm.JEE Main/Numerical/Medium/Experimental Physics
  30. 30In a Vernier Caliper 1010 divisions of Vernier scale is equal to the 99 divisions of main scale. When both jaws of Vernier calipers touch each other, the zero of the Vernier scale is shifted to the left of zero of the main scale and 4th{4}^{th} Vernier scale division exactly coincides with the main scale reading. One main scale division is equal to 1mm1mm. While measuring diameter of a spherical body, the body is held between two jaws. It is now observed that zero of the Vernier scale lies between 3030 and 3131 divisions of main scale reading and 6th{6}^{th} Vernier scale division exactly. coincides with the main scale reading. The diameter of the spherical body will be:JEE Main/MCQ/Medium/Experimental Physics
  31. 31A screw gauge of pitch 0.5mm0.5mm is used to measure the diameter of uniform wire of length 6.8cm6.8cm, the main scale reading is 1.5mm1.5mm and circular scale reading is 77. The calculated curved surface area of wire to appropriate significant figures is
    [Screw gauge has     5050 divisions on the circular scale]    JEE Main/MCQ/Medium/Experimental Physics
  32. 32The Vernier constant of Vernier callipers is 0.1mm0.1mm and it has zero error of (−0.05cm)\left(-0.05cm\right). While measuring diameter of a sphere, the main scale reading is 1.7cm1.7cm and coinciding vernier division is 55 . The corrected diameter will be _____×10−2cm\times {10}^{-2}cm.JEE Main/Numerical/Medium/Experimental Physics
  33. 33A student in the laboratory measures thickness of a wire using screw gauge. The readings are 1.22mm,1.23mm,1.19mm1.22mm,1.23mm,1.19mm and 1.20mm1.20mm. The percentage error is x121\dfrac{x}{121}%. The value of xx is _____ .JEE Main/Numerical/Medium/Experimental Physics
  34. 34A travelling microscope is used to determine the refractive index of a glass slab. If 40 divisions are there in 1cm1cm on main scale and 5050 Vernier scale divisions are equal to 4949 main scale divisions, then least count of the travelling microscope is _____ ×10−6m\times {10}^{-6}m.JEE Main/Numerical/Medium/Experimental Physics
  35. 35In a vernier callipers, each cmcm on the main scale is divided into 2020 equal parts. If tenth vernier scale division coincides with nineth main scale division. Then the value of vernier constant will be _____ ×10−2mm\times {10}^{-2}mmJEE Main/Numerical/Medium/Experimental Physics
  36. 36The diameter of a spherical bob is measured using a vernier callipers. 99 divisions of the main scale, in the vernier callipers, are equal to 1010 divisions of vernier scale. One main scale division is 1mm.1mm. The main scale reading is 10mm10mm and 8th{8}^{th} division of vernier scale was found to coincide exactly with one of the main scale division. If the given vernier callipers has positive zero error of 0.04cm,0.04cm, then the radius of the bob is _____________ ×10−2cm.\times {10}^{-2}cm.JEE Main/Numerical/Medium/Experimental Physics
  37. 37In a Screw Gauge, fifth division of the circular scale coincides with the reference line when the ratchet is closed. There are 5050 divisions on the circular scale, and the main scale moves by 0.5mm0.5mm on a complete rotation. For a particular observation the reading on the main scale is 5mm5mm and the 20th{20}^{\text{th}} division of the circular scale coincides with reference line. Calculate the true reading.JEE Main/MCQ/Medium/Experimental Physics
  38. 38AssertionA:AssertionA: If in five complete rotations of the circular scale, the distance travelled on the main scale of the screw gauge is 5mm5mm and there are 5050 total divisions on a circular scale, then the least count is 0.001cm.0.001cm.
    ReasonR:ReasonR:
    Least Count     =PitchTotal divisions on circular scale=\dfrac{\text{Pitch}}{\text{Total divisions on circular scale}}
    In the light of the above statements, choose the most appropriate answer from the options given below.    JEE Main/MCQ/Medium/Experimental Physics
  39. 39Student AA and student BB used two screw gauges of equal pitch and 100100 equal circular divisions to measure the radius of a given wire. The actual value of the radius of the wire is 0.322cm0.322cm. The absolute value of the difference between the final circular scale readings observed by the students AA and BB is _______.
    [Figure shows position of reference     OO when jaws of screw gauge are closed]
    Given pitch     =0.1cm=0.1cm.
    JEE Main/Numerical/Medium/Experimental Physics/With diagram
  40. 40The vernier scale used for measurement has a positive zero error of 0.2mm.0.2mm. If while taking a measurement it was noted that 00 on the vernier scale lies between 8.5cm8.5cm and 8.6cm8.6cm. Vernier coincidence is 6,6, then the correct value of measurement is cm.cm.
    (least count    =0.01cm=0.01cm)    JEE Main/MCQ/Medium/Experimental Physics
  41. 41One main scale division of a vernier callipers is aa cmcm and nth{n}^{th} division of the vernier scale coincide with (n−1)th{\left(n-1\right)}^{th} division of the main scale. The least count of the callipers in mmmm is :JEE Main/MCQ/Medium/Experimental Physics
  42. 42The pitch of the screw gauge is 1mm1mm and there are 100100 divisions on the circular scale. When nothing is put in between the jaws, the zero of the circular scale lies 88 divisions below the reference line. When a wire is placed between the jaws, the first linear scale division is clearly visible while 72nd{72}^{\text{nd}} division on circular scale coincides with the reference line. The radius of the wire isJEE Main/MCQ/Medium/Experimental Physics
  43. 43A student measuring the diameter of a pencil of circular cross-section with the help of a vernier scale records the following four readings 5.50mm5.50mm, 5.55mm5.55mm, 5.34mm5.34mm, 5.65mm5.65mm. The average of these four reading is 5.5375mm5.5375mm and the standard deviation of the data is 0.07395mm0.07395mm. The average diameter of the pencil should therefore be recorded as :JEE Main/MCQ/Medium/Experimental Physics
  44. 44A screw gauge has 50 divisions on its circular scale. The circular scale is 4 units ahead of the pitch scale marking, prior to use. Upon one complete rotation of the circular scale, a displacement of 0.5mm0.5mm is noticed on the pitch scale. The nature of zero error involved and the lest count of the screw gauge, are respectively:JEE Main/MCQ/Medium/Experimental Physics
  45. 45Using screw gauge of pitch 0.1cm0.1cm and 5050 divisions on its circular scale, the thickness of an object is measured. It should correctly be recorded as,JEE Main/MCQ/Medium/Experimental Physics
  46. 46The least count of the main scale of a vernier calipers is 1mm1mm. Its vernier scale is divided into 1010 divisions and coincide with 99 divisions of the main scale. When jaws are touching each other, the 7th{7}^{th} division of the vernier scale coincides with a division of the main scale and the zero of vernier scale is lying right side of the zero of the main scale. When this vernier is used to measure the length of the cylinder the zero of the vernier scale between 3.1cm3.1cm and 3.2cm3.2cm and 4th{4}^{th} VSD coincides with the main scale division. The length of the cylinder is (VSD is vernier scale division)JEE Main/MCQ/Medium/Experimental Physics
  47. 47If the screw on a screw-gauge is given six rotations, it moves by 3mm3mm on the main scale. If there are 5050 divisions on the circular scale the least count of the screw gauge is:JEE Main/MCQ/Medium/Experimental Physics
  48. 48A tunning fork of frequency 480Hz480Hz is used in an experiment for measuring speed of sound (v)\left(v\right) in air by resonance tube method. Resonance is observed to occur at two successive lengths of the air column, l1=30cm{l}_{1}=30 cm and l2=70cm.{l}_{2}=70 cm. Then, ν\nu is equal to:JEE Main/MCQ/Medium/Experimental Physics
  49. 49In a meter bridge experiment, the circuit diagram and the corresponding observation table are shown in figure.
     S. No. R(Ω)R\left(\Omega \right) l(cm)l\left(cm\right)
    1.
    2.
    3.
    4.
    10001000
    100100
    1010
    11
    6060
    1313
    1.51.5
    1.01.0
    Which of the reading is inconsistent?    JEE Main/MCQ/Medium/Experimental Physics/With diagram
  50. 50A load of mass MkgMkg is suspended from a steel wire of length 2m2m and radius 1.0mm1.0mm in Searle's apparatus experiment. The increase in length produced in the wire is 4.0mm.4.0mm. Now the load is fully immersed in a liquid of relative density 2.2. The relative density of the material of load is 8.8. The new value of increase in length of the steel wire is:JEE Main/MCQ/Medium/Experimental Physics
  51. 51In a meter bridge, the wire of length 1m1m has a non-uniform cross-section such that, the variation dRdl\dfrac{dR}{dl} of its resistance RR with length ll is dRdl∝1l.\dfrac{dR}{dl}\propto \dfrac{1}{\sqrt{l}}. Two equal resistances are connected as shown in the figure. The galvanometer has zero deflection when the jockey is at point P.P. What is the length AP?AP?

    JEE Main/MCQ/Medium/Experimental Physics/With diagram
  52. 52The least count of the main scale of a screw gauge is 1mm.1mm. The minimum number of divisions on its circular scale required to measure 5μm5\mu m diameter of a wire is:JEE Main/MCQ/Medium/Experimental Physics
  53. 53In the experimental set up of metre bridge shown in the figure, the null point is obtaine data distance of 40 cm40 \mathrm{~cm} from

    A. If a     10Ω10 \Omega resistor is connected in series with R1,\mathrm{R}_{1}, the null point shifts by 10 cm10 \mathrm{~cm}. The resistance that should be connected in parallel with (R1+10)Ω\left(\mathrm{R}_{1}+10\right) \Omega such that the null point shifts back to its initial position is

    JEE Main/MCQ/Medium/Experimental Physics/With diagram
  54. 54The resistance of the meter bridge AB in given figure is 4Ω4 \Omega. With a cell of emf ε=0.5 V\varepsilon=0.5 \mathrm{~V} and rheostat resistance Rh=2Ω\mathrm{R}_{\mathrm{h}}=2 \Omega the null point is obtained at some point J. When the cell is replaced by another one of emf ε=ε2\varepsilon=\varepsilon_{2} the same null point J\mathrm{J} is found for Rh=6Ω\mathrm{R}_{\mathrm{h}}=6 \Omega. The emf⁡ε2\operatorname{emf} \varepsilon_{2} is:

    JEE Main/MCQ/Medium/Experimental Physics/With diagram
  55. 55A potentiometer wire ABAB having length LL and resistance 12r12r is joined to a cell DD of emf ϵ\epsilon and internal resistance rr. A cell CC having EMF ϵ/2\epsilon /2 and internal resistance 3r3r is connected. The length AJAJ, at which the galvanometer, as shown in the figure, shows no deflection is

    JEE Main/MCQ/Medium/Experimental Physics/With diagram
  56. 56The pitch and the number of divisions, on the circular scale, for a given screw gauge are 0.5mm0.5mm and 100100 respectively. When the screw gauge is fully tightened without any object, the zero of its circular scale lies 33 divisions below the mean line.

    The readings of the main scale and the circular scale, for a thin sheet, are     5.5mm5.5mm and 4848 respectively, the thickness of this sheet is:    JEE Main/MCQ/Medium/Experimental Physics
  57. 57In a screw gauge, 55 complete rotations of the screw cause it to move a linear distance of 0.25cm0.25cm. There are100100 circular scale divisions. The thickness of a wire measured by this screw gauge gives a reading of 44 main scale divisions and 3030 circular scale divisions. Assuming negligible error, the thickness of the wire isJEE Main/MCQ/Medium/Experimental Physics
  58. 58In a screw gauge, 5 complete rotations of the screw cause it to move a linear distance of 0.250.25 cm\mathrm{cm}. There are 100 circular scale divisions. The thickness of a wire measured by this screw gauge gives a reading of 4 main scale divisions and 30 circular scale divisions. Assuming negligible zero error, the thickness of the wire is:JEE Main/MCQ/Medium/Experimental Physics
  59. 59A screw gauge with a pitch of 0.5mm0.5mm and a circular scale with 5050 divisions is used to measure the thickness of a thin sheet of aluminium. Before starting the measurement, it is found that when the two jaws of the screw gauge are brought in contact, the 45th{45}^{th} division coincides with the main scale line and that the zero of the main scale is barely visible. What is the thickness of the sheet if the main scale reading is 0.5mm0.5mm and the 25th{25}^{th} division coincides with the main scale line?JEE Main/MCQ/Medium/Experimental Physics
  60. 60Diameter of a steel ball is measured using a Vernier calipers which has divisions of 0.1 cm on its main scale (MS) and 10 divisions of its Vernier scale (VS) match 9 divisions on the main scale. Three such measurements for a ball are given as: S.No. MS (cm) VS divisions 1. 0.5 8 2. 0.5 4 3. 0.5 6
    If the zero error is - 0.03 cm, then mean corrected diameter is:    JEE Main/MCQ/Medium/Experimental Physics
  61. 61
    In an experiment to determine the gravitational acceleration     gg of a place with the help of a simple pendulum, the measured time period squared is plotted against the string length of the pendulum in the figure. What is the value of gg at the place?    JEE Main/MCQ/Medium/Experimental Physics/With diagram
  62. 62A student measured the length of a rod and wrote it as 3.50 cm. Which instrument did he use to measure it ?JEE Main/MCQ/Medium/Experimental Physics
  63. 63Correct set up to verify Ohm's law is :JEE Main/MCQ/Medium/Experimental Physics
  64. 64NN divisions on the main scale of a vernier calliper coincide with (N+1)(N+1) divisions of the vernier scale. If each division of main scale is ' aa ' units, then the least count of the instrument isJEE Main/MCQ/Medium/Experimental Physics
  65. 65A spectrometer gives the following reading when used to measure the angle of a prism.
    Main scale reading:     58.558.5 degree
    Vernier scale reading :     0909 divisions
    Given that     11 division on main scale corresponds to 0.50.5 degree. Total divisions on the vernier scale is 3030 and match with 2929 divisions of the main scale. The angle of the prism from the above data    JEE Main/MCQ/Medium/Experimental Physics
  66. 66A screw gauge gives the following reading when used to measure the diameter of a wire.
    Main scale reading :     0 mm0 \mathrm{~mm}
    Circular scale reading : 52 divisions
    Given that     1 mm1 \mathrm{~mm} on main scale corresponds to 100 divisions of the circular scale.
    The diameter of wire from the above date is :    JEE Main/MCQ/Medium/Experimental Physics
  67. 67In an experiment the angles are required to be measured using an instrument. 29 divisions of the main scale exactly coincide with the 30 divisions of the vernier scale. If the smallest division of the main scale is half-a-degree (=0.5∘)\left(=0.5^{\circ}\right), then the least count of the instrument isJEE Main/MCQ/Medium/Experimental Physics
  68. 68Two full turns of the circular scale of a screw gauge cover a distance of 1 mm1 \mathrm{~mm} on its main scale. The total number of divisions on the circular scale is 50 . Further, it is found that the screw gauge has a zero error of −0.03 mm-0.03 \mathrm{~mm} while measuring the diameter of a thin wire, a student notes the main scale reading of 3 mm3 \mathrm{~mm} and the number of circular scale divisions in line with the main scale as 35 . The diameter of the wire isJEE Main/MCQ/Medium/Experimental Physics
  69. 69Shown in the figure below is a meter-bridge set up with null deflection in the galvanometer.


    The value of the unknown resistor     RR is    JEE Main/MCQ/Medium/Experimental Physics/With diagram
  70. 70In a Vernier calipers, when both jaws touch each other, zero of the Vernier scale is shifted to the right of zero of the main scale and 7th7^{\text{th}} Vernier division coincides with a main scale reading. If the value of 11 main scale division is 11 mm and there are 1010 Vernier scale divisions, then the Vernier caliper hasJEE Main/MCQ/Medium/Vernier Callipers

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